Weathering crusts on peridotite

Bucher, Kurt; Stober, Ingrid; Müller-Sigmund, Hiltrud

doi:10.1007/s00410-015-1146-3

Cited by 12 publications

(3 citation statements)

References 42 publications

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“…The investigations of Bucher et al (2015) in surface waters of the Ronda peridotite, southern Spain, also showed relatively high TDS (275-563 mg L -1 ) and elevated pH values (8.36-8.54). In all waters Mg and HCO 3 were also the dominant ions.…”

Section: Discussionmentioning

confidence: 92%

“…Investigations on surface waters in ultramafic rock and/ or gabbro catchments have been carried out by, e.g., Barnes & O'Neil (1969), Barnes et al (1978), Clark & Fontes (1990), Gascogne & Kamieni (1993), Drever (1997), Venturelli et al (1997), Zedef et al (2000), Zakharova et al (2007), Zhou (2010), Chavagnac et al (2013) and Bucher et al (2015). Typical waters from ultramafic rock terrains are Mg-HCO 3 type waters with elevated pH values.…”

Section: Introductionmentioning

confidence: 99%

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Chemical composition of surface- and groundwater in fast-weathering silicate rocks in the Seiland Igneous Province, North Norway

Stober¹,

Teiber²,

Li³

et al. 2017

NJG

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The geochemical composition of nepheline-syenite, carbonatite, ultramafic rocks and gabbro samples from the Seiland Igneous Province is presented in terms of whole-rock chemistry, major and selected trace elements, and mineralogy. Additionally, the hydrochemistry of around 100 surface water, groundwater, rainfall and seawater samples from the area is presented. Surface water and groundwater solute chemistry can be explained in terms of reaction of precipitation with bedrock minerals: the waters thus acquire a clear chemical signature dependent on the catchment's lithology. The mineralisation of the waters (total dissolved solids or TDS) is generally low, although it is somewhat elevated in carbonatite-or nepheline-syenitedominated terrains, in comparison with ultramafic, gabbro or granitic terrains. Additionally, each lithology exhibits its specific water type. Thus, waters in a nepheline-syenite-dominated terrain tend to be Ca-Na-HCO 3 rich with relatively high pH, whereas waters in carbonatite terrains are Ca-HCO 3 dominated with only slightly elevated pH. Waters in ultramafic rocks exhibit strongly elevated Mg concentrations with circumneutral pH, whereas waters from gabbros are variable in terms of their major cation (Mg, Ca, Na) composition. Mineral stability diagrams aid our understanding of the evolution of rainwater by chemical interaction with rocks in each lithology. In gabbro and ultramafic terrains, such diagrams suggest that kaolinite is likely to be the primary alteration product and that saturation with respect to calcite will not be reached; instead, the waters will evolve until saturation with respect to stilbite (a Na-Ca zeolite mineral) is attained. Waters in ultramafic rocks will then follow this stable phase boundary until saturation with respect to chlorite is achieved. The gabbro waters, on the other hand, could also follow the stable phase-boundary to stilbite until saturation with respect to paragonite (a sodium mica) is reached, depending on the plagioclase-to-clinopyroxene ratio (Plg/Cpx). Surprisingly, it is found that olivine (i.e., forsterite) does not control the water chemistry in gabbros and ultramafic rocks..

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Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Chemical composition of surface- and groundwater in fast-weathering silicate rocks in the Seiland Igneous Province, North Norway

Stober¹,

Teiber²,

Li³

et al. 2017

NJG

Self Cite

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“…For this study, we selected: (1) a laterite profile developed from the alteration of ultramafic rocks of the subcontinental lithospheric mantle (SCLM) units exposed in Los Reales, Serranía de Ronda, in the Málaga province of Spain [8]; and (2) a laterite profile formed from the weathering of oceanic lithospheric mantle (OLM) peridotites exposed in Camán, Coastal Cordillera, in the Valdivia province of Chile [9][10][11]. The mantle peridotites of Ronda are products of partial melting and kilometric scale refertilization by asthenospheric melts in the SCLM [12] and were hydrated at low P-T conditions [13], whereas those from the Coastal Cordillera of Chile originated in an oceanic setting and were later hydrated at higher P-T conditions during subduction [14]. Our study revealed that, outside the typical climate conditions expected for laterization, embryonic-to-proto laterites might also form, and economic metals may be already mobilized to certain degree of intensity.…”

Section: The Los Reales Range Serranía De Ronda In Southwestern Spainmentioning

confidence: 99%

Metal Mobility in Embryonic-to-Proto-Ni-Laterite Profiles from Non-Tropical Climates

Gonzáléz-Jiménez

Villanova-de-Benavent

Yesares

et al. 2023

Minerals

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We evaluated the mobility of a wide suite of economic metals (Ni, Co, REE, Sc, PGE) in Ni-laterites with different maturities, developed in the unconventional humid/hyper-humid Mediterranean climate. An embryonic Ni-laterite was identified at Los Reales in southern Spain, where a saprolite profile of ~1.5 m thick was formed at the expense of peridotites of the subcontinental lithospheric mantle. In contrast, a more mature laterite was reported from Camán in south-central Chile, where the thicker (~7 m) weathering profile contains well-developed lower and upper oxide horizons. This comparative study reveals that both embryonic and mature laterites can form outside the typical (sub)-tropical climate conditions expected for lateritic soils, while demonstrating a similar chemical evolution in terms of major (MgO, Fe2O3, and Al2O3), minor (Ni, Mn, Co, Ti, Cr), and trace (REE, Y, Sc, PGE, Au) element concentrations. We show that, even in the earliest stages of laterization, the metal remobilization from primary minerals can already result in uneconomic concentration values.

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Metamorphism of Ultramafic Rocks

Bucher

2023

Springer Textbooks in Earth Sciences, Geography and Environment

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Weathering crusts on peridotite

Cited by 12 publications

References 42 publications

Chemical composition of surface- and groundwater in fast-weathering silicate rocks in the Seiland Igneous Province, North Norway

Chemical composition of surface- and groundwater in fast-weathering silicate rocks in the Seiland Igneous Province, North Norway

Metal Mobility in Embryonic-to-Proto-Ni-Laterite Profiles from Non-Tropical Climates

Metamorphism of Ultramafic Rocks

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